During his Walk Across America to inspire others, Grammy-nominated singer and songwriter Mike Posner says he was bitten by a baby rattlesnake in Colorado. "That venom is no joke! I got to the hospital and got the anti-venom in time," he wrote on Instagram. Now, the 31-year-old is learning to walk again, step by step. InsideEdition.com's Stephanie Officer explains how Posner is remaining true to his motto, "Keep going."